The silver lining would be the preliminary injunction blocking enforcement of the federal ban, leading to the ban being stricken as unconstitutional under the common-use test in Heller and thus being applied to the California limit via McDonald.

That is the silver lining. The OP is way off base.

Btw I piss on California every day, off the deck, at about 6:30. There used to be a Google earth shot of that. In the summer of course.